cpp/cs104/polymorphism/virtfunc2 Source

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Description
html markup
shown to student

Predict what will be printed by this program.
Epilogue
html markup
shown when solved

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Remarks
Comments, history, license, etc.

Copied from problem cpp/cs104/polymorphism/virtfunc1 (author: redekopp@usc.edu)
Copied from problem cpp/cs104/polymorphism/shapes (author: redekopp@usc.edu)

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Engine
Choices
json list of string, bool pairs
e.g. [["good", true], ["bad", false]]

Correct answer
Template / Reference solution

Template / Reference solution

#include <iostream>
#include <string>
#include <vector>
using namespace std;

class Packager {
public:
virtual ~Packager() {}
string package(string& s) {
return material() + s + material();
}
protected:
virtual string material() { return "-"; }
private:

};

class APackager : public Packager {
protected:
string material() { return "A"; }
};

class DblPackager : public APackager {
public:
string package(string& s) {
return material() + Packager::package(s) + material();
}
};
int main()
{
Packager *p = new Packager;
APackager *a = new DblPackager;
DblPackager *d = new DblPackager;
string s1 = "123";
cout << p->package(s1) << endl;
cout << a->package(s1) << endl;
cout << d->package(s1) << endl;
delete p; delete a; delete d;
return 0;
}

Java test suite
See manual

C++ test suite
json list of stdin/args tests
e.g. [{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]
to just run once with no input use [{}]

[{}]
C++ test suite
See manual

Forbidden substrings
json list of strings
e.g. ["for","while"]

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Solution visibility remove
Java imports
json list of importables
e.g. ["java.util.*"]

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Override Java classname
else defaults to
websheet name
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Dependent on other websheets?
json list of websheet names in this folder
e.g. ["DataStructure"]

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Is example?
i.e., just a demo
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Add compiler flag(s)
json list of flags
e.g. ["-Wno-unused-variable"]

remove
Remove default compiler flag(s)
json list of flags
see default_cppflags
e.g. ["-Wno-write-strings"]

remove

Property	Value
Description html markup shown to student	Predict what will be printed by this program.
Epilogue html markup shown when solved	remove
Public permissions	remove
Remarks Comments, history, license, etc.	Copied from problem cpp/cs104/polymorphism/virtfunc1 (author: redekopp@usc.edu) Copied from problem cpp/cs104/polymorphism/shapes (author: redekopp@usc.edu) remove
Engine
Choices json list of string, bool pairs e.g. `[["good", true], ["bad", false]]`
Correct answer
Template / Reference solution
Template / Reference solution	#include <iostream> #include <string> #include <vector> using namespace std; class Packager { public: virtual ~Packager() {} string package(string& s) { return material() + s + material(); } protected: virtual string material() { return "-"; } private: }; class APackager : public Packager { protected: string material() { return "A"; } }; class DblPackager : public APackager { public: string package(string& s) { return material() + Packager::package(s) + material(); } }; int main() { Packager p = new Packager; APackager a = new DblPackager; DblPackager *d = new DblPackager; string s1 = "123"; cout << p->package(s1) << endl; cout << a->package(s1) << endl; cout << d->package(s1) << endl; delete p; delete a; delete d; return 0; }
Java test suite See manual
C++ test suite json list of stdin/args tests e.g. `[{"stdin":"hi", "args":["4", "5"]}, {"stdin":"noargs"}]` to just run once with no input use `[{}]`	[{}]
C++ test suite See manual
Forbidden substrings json list of strings e.g. `["for","while"]`	remove
Solution visibility	remove
Java imports json list of importables e.g. `["java.util.*"]`	remove
Override Java classname else defaults to websheet name	remove
Dependent on other websheets? json list of websheet names in this folder e.g. `["DataStructure"]`	remove
Is example? i.e., just a demo	remove
Add compiler flag(s) json list of flags e.g. `["-Wno-unused-variable"]`	remove
Remove default compiler flag(s) json list of flags see default_cppflags e.g. `["-Wno-write-strings"]`	remove

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